Table 6.

Characteristics of children with and without DNA available

	Children (n = 8,821)
	DNA available (n = 5,908)	No DNA available (n = 2,913)
Male (%)	50.6	50.1
Birth weight (grams)	3,444 (520)	3,280 (671)
Birth weight <2,500 g (%)	3.3	10.8
Gestational age (weeks)	40.1 (37.1–42.0)	39.9 (34.7–42.1)
Gestational age <37 weeks (%)	3.9	11.2
Ethnicity (%)
Dutch, other-European	64.7	54.6
Surinamese	7.4	9.0
Moroccan	6.5	7.9
Turkish	7.5	9.5
Dutch Antilles	3.8	4.8
Cape Verdian	2.4	3.5
Others	7.7	10.7

Values are percentages, means (standard deviation) or median (95% range)